package operation;

import book.Book;
import book.BookList;

import java.util.Scanner;

public class DelOperation implements IOPeration {
    public void work(BookList bookList) {
        System.out.println("删除图书！");
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入要删除的书名：");
        String name = scanner.nextLine();
        int currentSize = bookList.getUsedSize();
        int i = 0;
        int pos = 0;
        for(; i < currentSize; i++) {
            Book book = bookList.getBook(i);
            if(book.getName().equals(name)) {
                pos = i;
                break;
            }
        }
        if(i == currentSize) {
            System.out.println("没有你要删除的这本书！");
        }
        int j = 0;
        for(j = pos; j < currentSize - 1; j++) {
             Book book = bookList.getBook(j + 1);
             bookList.setBook(j, book);
        }

        bookList.setBook(currentSize - 1, null);
        bookList.setUsedSize(currentSize - 1);
    }
}
//public class DelOperation implements IOPeration{
//
//
//    @Override
//    public void work(BookList bookList) {
//        System.out.println("删除图书！");
//        Scanner scanner = new Scanner(System.in);
//        System.out.println("请输入你要删除的图书：");
//        String name = scanner.nextLine();
//
//        int pos = -1;
//
//        int currentSize = bookList.getUsedSize();
//        int i = 0;
//        for (; i < currentSize; i++) {
//            Book book = bookList.getBook(i);
//            if(book.getName().equals(name)) {
//                pos = i;
//                break;
//            }
//        }
//
//        if(i == currentSize) {
//            System.out.println("没有你要删除的图书！");
//            return;
//        }
//        //开始删除
//        int j = pos;
//        for (; j < currentSize-1; j++) {
//            //[j] = [j+1]
//            Book book = bookList.getBook(j+1);
//
//            bookList.setBook(j,book);
//        }
//
//        bookList.setBook(j,null);
//
//        bookList.setUsedSize(currentSize-1);
//    }
//}